Attentional modulation of neural processing of shape, color, and velocity in humans

Article Abstract:

We are all bombarded by sensory information (sight, sound, touch, smell and taste) all of the time, and it is impossible for our brains to assimilate all that data at once. People usually respond to only a small portion of sensory information received. In this study of how people look for key visual information, researchers used positron emission tomography (PET) to measure changes in certain regions of the brain in response to visual stimuli. (PET is a sophisticated imaging technique that allows study of biochemical activity in the body.) Attributes such as the shape, color, or velocity of objects influences the behavioral and physiological measures of how visual processing occurs. Different parts of the brain seem to be involved in responses to shape, color, and velocity. Focusing attention on one attribute rather than among several increases the chance for seeing subtle changes, and changes the way different parts of the brain responsible for seeing (the visual cortex) processes information. (Consumer Summary produced by Reliance Medical Information, Inc.)

Methods, Analysis, Usage, Measurement, Vision research, PET imaging, Positron emission tomography, Brain chemistry, Senses and sensation, Senses

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How the brain creates imagery: projection to primary visual cortex

Article Abstract:

Research indicates that visual imagery activates the primary visual cortex and that visual perception and visual imagery share a common neural substrate. Recent advances in the understanding of how the brain generates, stores and maintains visual imagery are discussed.

Research, Physiological aspects, Visual perception, Visualization (Mental images), Visualization (Psychology)

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